Which of the following answer correctly identifies the reduction-oxidation reaction below and gives the correct reasoning? *The choices are shown in image

Answer choices-

a )Reaction I. The oxidation state of Na(s) and Cl2(g) both change.
b) Reaction II. The Co2+ in Co(NO3)2 (aq) changes from aqueous to solid in CoI2 (s).
c) Reaction III. The C in NaHCO3 (s) changes to a gas in CO2 (g).
d) Reaction IV. The sodium is changing state.

The correct answer : reaction 1

Further explanation

Given

Chemical reaction

Required

The reduction-oxidation reaction

Solution

Reaction 1

The reduction-oxidation reaction

Na oxidation, from 0 to +1

Cl reduction, from 0 to -1

Reaction 2

The oxidation number of Co does not change, remains +2, and the reaction is not oxidation-reduction but double displacement

Reaction 3

The oxidation number C does not change constantly +4 in either NaHCO3 or CO2 compounds, and the reaction is a decomposition reaction

Reaction 4

The oxidation number of Na remains unchanged at +1 in either NaOH or NaC2H3O2 compounds, and the reaction is a neutralization reaction

Rethink and reinvent

Sink to the bottom. addition of potassium nitrate past it’s dissolution capacity at a particular temperature will cause the extra to just sink to the bottom of the glass.however, if you were to raise the temperature of the solution prior to dissolving it, and then slowly decrease the temperature after the dissolution, you would create a “supersaturated” solution - a solution that has more solute dissolved into it than should be allowed. if you add any extra solute past this, the entire solution would “crystallize,” and this is how you get those cool videos on youtube.